KR100308495B1 - Thin film type transformer and Process Method Thereof - Google Patents

Abstract

PURPOSE: A thin film transformer and a manufacturing method thereof are provided to reduce variation of an inductance value due to frequency and enhance heat-resisting characteristic by depositing copper on a ferrite and trimming. CONSTITUTION: A thin film transformer comprises bodies(10) and thin film layers(12) over the bodies(10). The bodies(10) are of ferrite. The thin film layers(12) are formed by copper by a sputtering method or a non-electrolysis plating method to have high frequency availability and smaller variation of inductance and better heat-resisting characteristic than enamel coated copper wire. Cap elements(20) are assembled at both ends of the bodies(10). Cutting grooves(14) are formed over the bodies(10) and the thin film layers(12) to obtain a desired inductance. A first part having the cutting groove(14) is electrically connected to a second part having the cutting groove(14) that is correspondingly to the first part with conductive wires(30).

Description

Thin film type transformer and process method thereof {Thin film type transformer and Process Method Thereof}

The present invention relates to a thin-film transformer and a method for manufacturing the same, and more particularly, to a thin-film transformer and a method for manufacturing the same, which have a small amount of change in inductance value according to a frequency by giving copper to ferrite and trim.

In general, a transformer is a component used in most electrical and electronic products, and is an electronic component that transforms a commercial AC power supply to an appropriate level so that the product is driven by a desired rated voltage.

Usually, the coils are wound on the core bobbin in an appropriate ratio corresponding to the rated voltage to obtain the primary coils and the secondary coils, and the primary coils and the secondary coils are insulated so as to be electrically separated from each other.

When the transformer of such a configuration applies a commercial AC power source to the primary coil side, the induced voltage is induced on the secondary coil side having an appropriate winding ratio with respect to the primary coil side according to the law of electromagnetic induction, and the induced voltage is, for example, a DC power source. Is applied to the load side and the action at the rated voltage of the load is performed.

The heat resistance of the insulation of a typical transformer is up to about 200 ℃. If the external shape is to be reduced, select the one with high permissible temperature if necessary when embedded in the enclosed space.

Coils vary considerably with frequency, temperature and time. Therefore, it is expected to secure the reliability of products that maintain characteristics such as frequency band and temperature range. In general, since the resonant frequency is inversely proportional to the device size, the smaller the size, the wider the frequency range used.

Conventional transformers are enameled in copper wire and have a disadvantage of melting at low temperatures. Therefore, in addition to the deterioration of electrical characteristics, in addition to the basic problem of complete failure may affect the insulation.

In some cases, there is a problem that the paper insulation melts and becomes a cause of fire.

The present invention has been made in view of the problems of the conventional transformer to solve the problem, by depositing copper and ferrite in the ferrite thin film type transformer and a method of manufacturing the same, the amount of change in the inductance value according to the frequency and improved heat resistance To provide.

1 is a cross-sectional view showing the main structure of the thin-film transformer of the present invention

Figure 2a is a graph comparing the characteristics according to the change in inductance-frequency of the prior art and the present invention

Figure 2b is a graph showing the characteristics according to the change in inductance-frequency of the prior art

Figure 2c is a graph showing the characteristics of the inductance-frequency change of the present invention

3 is a flow chart showing a manufacturing method of a thin-film transformer of the present invention.

<Explanation of symbols for main parts of the drawings>

10: body 12: thin film layer

20: cap body 14: cutting groove

30: lead wire

The thin-film transformer of the present invention for achieving the above object,

In the transformer,

Primary and secondary bodies having a predetermined length,

A thin film layer to be thin-film processed on both bodies;

Cutting grooves formed in the thin film layer and the body to obtain electrical characteristics;

A cap body installed at both ends of the body,

A conductive wire for electrically connecting the cap bodies of the two bodies;

It consists of a molding material for protecting the said component.

In this configuration, it is preferable that the body is ferrite, the thin film layer is copper, and the cutting groove is formed spirally.

In addition, the manufacturing method of the thin-film transformer of the present invention,

Processing the primary and secondary bodies to a predetermined size;

Forming a conductive thin film layer on both bodies;

Attaching cap bodies to both ends of the bodies;

Forming a plurality of cutting grooves on both the body and the thin film layer;

Electrically connecting both cap bodies;

Molding the component with a predetermined molding material,

And coating to give a color code indicating specifications on the surface of the molding material.

In this manufacturing method, the thin film layer is preferably formed by a sputtering method or an electroless plating method, and the cutting groove is preferably formed by a laser cutting machine, a rubber cutting machine or a diamond cutting machine.

Therefore, since the thin film is formed in the body without cutting the coil and the cutting groove is formed so as to obtain the L value, the number of parts used is small and the manufacturing cost is low and the size is smaller than that of the conventional transformer coil or the insulator. In particular, it is a revolutionary technology in the field of transformers because of its excellent electrical characteristics and heat resistance.

1 is a cross-sectional view showing the main structure of the thin-film transformer of the present invention.

In this figure, reference numeral 10 denotes a body and 12 a thin film layer. It is preferable that the material of this element 10 is ferrite. On this body 10, copper is thin filmed by sputtering or an electroless plating method. By forming the thin film layer 12, the rate of change of the inductance value according to the use of the high frequency band and the frequency is small and has better heat resistance than enameled copper wire.

Cap bodies 20 are assembled at both ends of the body 10 to form cutting grooves 14 throughout the body 10 and the thin film layer 12 in order to obtain a desired inductance value.

Subsequently, the primary side on which the predetermined number of cutting grooves 14 are formed and the secondary side having the cutting grooves 14 formed correspondingly to the primary side are electrically connected to each other using the conductive wires 30.

Next, the manufacturing method of the thin-film transformer of this invention is demonstrated with reference to FIG. First, the body 10 is processed to a predetermined size, and the thin film layer 12 is formed by thin film using copper by sputtering or the like on the body 10. The cutting groove 14 is processed on the thin film layer 12 and the body 10 to attach the cap body 20 to both ends of the body 10 and to obtain a predetermined inductance.

The processing of the cutting groove 14 is not limited to any special means, and any equipment that processes the fine grooves in a spiral shape is not relevant, but in terms of workability, such as a professional cutting machine, for example, laser cutting machine, rubber cutting machine, diamond cutting machine It is preferable to use.

Subsequently, in order to electrically connect the primary side and the secondary side completed through the above process, the welding connection is performed using the conductive wire 30, and finally, the exterior is molded and painted with an epoxy resin or the like.

The thin-film transformer of the present invention thus produced has the characteristics as shown in Figs. 2A to 2C. Figure 2a is a graph showing the characteristics according to the change in inductance-frequency of the prior art and the invention, Figure 2b is a graph showing the characteristics according to the change in inductance-frequency of the conventional product, Figure 2c is a change in inductance-frequency of the present invention A graph showing the characteristics.

As demonstrated in these graphs, the inductor (L) value of the conventional inductor loses the heat treatment at 250 ° C. for 10 minutes. However, the inductor according to the present invention has an effect on the inductance (L) value even after applying 400 ° C. for 10 minutes. This was confirmed to be absent.

The thin-film transformer of the present invention has a constant L value up to 300 MHz, and the L value drops drastically when the resonance frequency is 400 MHz or more, but the frequency use is about 20 times wider than that of the conventional transformer.

As described above, according to the thin-film transformer of the present invention and a method of manufacturing the same, a thin film is formed in the body without forming a coil and a cutting groove is formed so as to obtain an L value. Compared to the use, the number of parts used is low, the manufacturing cost is low, and the size can be reduced. In particular, the electrical characteristics and the heat resistance are excellent, which is considered to be a revolutionary technology in the transformer field.

Claims (10)

In the transformer, Primary and secondary bodies having a predetermined length, A thin film layer to be thin-film processed on both bodies; Cutting grooves formed in the thin film layer and the body to obtain electrical characteristics; A cap body installed at both ends of the body, A conductive wire for electrically connecting the cap bodies of the two bodies; Thin-film transformer, characterized in that consisting of a molding material for protecting the component. The thin-film transformer according to claim 1, wherein the body is ferrite. The thin film transformer according to claim 1, wherein the thin film layer is copper. The thin-film transformer according to claim 1, wherein the cutting groove is helical. Processing the primary and secondary bodies to a predetermined size; Forming a conductive thin film layer on both bodies; Attaching cap bodies to both ends of the bodies; Forming a plurality of cutting grooves on both the body and the thin film layer; Electrically connecting both cap bodies; Molding the component with a predetermined molding material, A method of manufacturing a thin-film transformer, characterized in that the step of applying a coating to give a color code indicating the specifications on the surface of the molding material. The method of claim 5, wherein the thin film layer is formed by a sputtering method. The method of claim 5, wherein the thin film layer is formed by an electroless plating method. The method of claim 5, wherein the cutting groove is formed by a laser cutting machine. The method of claim 5, wherein the cutting groove is formed by a rubber cutter. The method of claim 5, wherein the cutting groove is formed by a diamond cutter.